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鄂尔多斯盆地东北部三叠系延长组长6储层为孔隙结构复杂的低孔隙度低渗透率储层。该地区长6储层的岩电实验分析结果表明,岩电关系较为复杂,其中地层因素-孔隙度关系中,a、m参数变化范围较大,a、m呈明显的反向关系,除个别存在微裂缝的储层m值接近于1外,胶结指数m与物性参数的关系与典型的中高孔渗储层不同,具体特征为m值随着孔隙度、渗透率的增大而增大;同时,含水饱和度-电阻率增大系数在双对数坐标下的关系除传统Archie公式的直线型外,很多还呈明显的“三段式”线性关系。
The Chang 6 reservoir of the Triassic Yanchang Formation in northeastern Ordos Basin is a reservoir of low porosity and porosity with complicated pore structure. The results of rock electric experiments in Chang 6 reservoir in this area show that the relationship between rock and electricity is rather complicated. Among them, in the stratigraphic factors-porosity relation, the parameters of a and m vary greatly, and a and m show obvious reverse relations. The value of m in the reservoirs with microcracks is close to 1, and the relationship between the cementation index m and the physical property parameters is different from that of the typical middle-high porosity and permeability reservoirs. The specific characteristic is that the value of m increases with the increase of porosity and permeability. At the same time, the relationship between water saturation and resistivity increase coefficient in double logarithmic coordinates is obviously “three-stage” linearity except for the straight line of the traditional Archie formula.